This frequency shift is used to calculate the api and density of the product. When product is injected into the unit this vibration is changed depending upon how heavy or light the product is. The method operates by using a U shaped tube that oscillates at a specific frequency. The lower api products are usually very high in carbon content, high in viscosity (very thick), High in sulfur, and tend to be darker in nature. See below for a breakdown of typical api gravities. Overseas many places use 15☌ or 20☌.Īpi and density also play important roles in the identification of products and distillate cuts. Here in the United States a temperature of 60☏ is the standard. For this reason standard organizations have reached agreements on what temperature to confirm quantities and volumes when measuring product levels. et A, which is mainly used in the United States, must have a freeze point of minus 40✬ or below and does not typically contain static dissipator additive. The primary difference between the two is freeze point, the temperature at which wax crystals disappear in a laboratory test. The inverse is true when the product is cooled, it becomes denser. Product Description Jet A and Jet A-1 are kerosene-type fuels. As petroleum products are heated they expand and become less dense.

Temperature is very important in relation to api and density. While an api of 80.0 is equal to 0.6684 g/cm3. For example at 60☏: an api of 10.0 is equal to 1.0000 g/cm3. Research Octane Number (RON) is measured with an engine speed of 600 rpm, while Motor Octane Number (MON) is measured with an engine speed of 900 rpm. The higher the api the less dense the sample is. 2) Octane number is a measure of the resistance of fuels to detonation or ignition. This measurement can be converted into any units used to measure weight and volume per customer request.ĪPI gravity is another expression of this measurement that uses the Density/Specific gravity for its conversion. This basically means that at 60☏ 0.7536 grams of the sample will occupy 1 cubic centimeter of space.

When running crude the same technology (Density Meter) is used but the method is D5002.ĭensity is expressed in units of mass per volume at a specific temperature. It can be used for Distillates and if heated Residual Fuel Oils. The purpose of this test is to determine the Density and Api of liquid petroleum products.

Jet a1 density vs temperature table